I'm demo'ing ZDT right now and I just wanted to chime in here as I've been listening to it on and off all day. Anyone who knows me knows I love tube amps and pairing them with the high impedance ZMF dynamic headphones. While I can't comment on how the amp works with planar's yet I can comment on how it works with headphones like the ZMF's, HD800 and the THxx. It really isn't just a good amp for $400, it's just a good amp. Nailing tonality and "weight" is something really hard to find in a tube amp of any price and the ZDT manages to do it. It is a slightly warm amp but not over the top, the upper mids/lower treble is very smooth and low end has lots of control. My favorite part of the amp is being able to go back and forth between the low/high Z out's to match each headphone. Having this really is necessary when going through a few different headphones on an amp like this, so I'm really happy it's included. I know it's a long wait for a lot of you guys but I just wanted to say i think it'll be worth it once you get it in hand.

Also - as an aside, I am not affiliated with MassDrop in any way aside from the fact I love the guys who run the show over there and we sell our pads through them sometimes! Nobody asked me to post a comment and I have no gain from talking here, I really just want to try to help as the hours count down on this guy.